const mongoose = require('mongoose');
module.exports = new Promise((resolve, reject) => {
    mongoose.set('useCreateIndex', true);
    mongoose.connect("mongodb://localhost:27017/pops", {
        useNewUrlParser: true,
        useUnifiedTopology: true
    });
    mongoose.connection.once('open', err => {
        if (!err) {
            console.log("数据库连接成功！！");
            resolve();
        } else {
            console.log(err);
            reject(err);
        }
    })
})